Abstract: A three-dimensional salt water cooling tower numerical simulation model was established to study the characteristics of drifts and salt deposition in nuclear power project. In this model, site meteorological data, design parameters of cooling tower, general layout, environmental characteristics are considered. The results show that when the natural wind direction is parallel to the tower row, two hot air streams are superimposed on each other as one, which is beneficial to reducing the influence of drifts and salt deposition on the environment. The drifts with particle size greater than 550 μm cannot escape from the outlet of cooling towers. In normal operation of 6 nuclear power units, the salt deposition will not cause serious damage to plants.